I bought the prima guide for this game and was very, very, disappointed. It provided a lot of the core basics, but relatively nothing extra. I won't buy another Prima guide and the best guide I ever purchased was made by Nintendo.
Anyone remember the " Pokedex " guide for G/S? God, I adored that thing, rated the strengths and weaknesses of all the Pokemon's stats, where you could find them, all their moves. It was all I needed for that game, I wish I had one for FR/LG
Anyway, I say stick to the Nintendo one, Prima let me down on this game.